instillment vs instillation

instillment and instillation both are nouns.

Word	Noun	Adjective	Verb	Adverb
instillment	Yes	No	No	No
instillation	Yes	No	No	No

As nouns, instillment and instillation are synonyms defined as:

instillment and instillation: the introduction of a liquid (by pouring or injection) drop by drop

Other synonyms of instillment include instilment.

instillment (noun)	instillation (noun)
the introduction of a liquid (by pouring or injection) drop by drop	the introduction of a liquid (by pouring or injection) drop by drop
	a liquid that is instilled drop by drop